Cars with active exhaust use a vacuum or electrically operated valve in the tailpipe to switch between a quiet and an open path. This spring is what returns that valve to its rest position when the actuator releases. A weak or broken spring leaves the valve lazy or stuck, which shows up as an exhaust note that does not change with drive mode.

Mopar Accessories 68319331AA Details:

• Fits select Chrysler 300, Dodge Challenger and Dodge Charger models with active exhaust.
• Returns the active exhaust valve to its rest position.
• Normally serviced together with the valve actuator.
• Genuine Mopar OEM spring rate for correct valve operation.
• Sold individually.